/*
 * Copyright (C) 2009 eXo Platform SAS.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.everrest.core.impl.header;

import org.everrest.core.header.AbstractHeaderDelegate;

import javax.ws.rs.core.MediaType;
import java.text.ParseException;
import java.util.Map;
import java.util.Map.Entry;

/**
 * @author <a href="mailto:andrew00x@gmail.com">Andrey Parfonov</a>
 * @version $Id: MediaTypeHeaderDelegate.java 285 2009-10-15 16:21:30Z aparfonov
 *          $
 */
public class MediaTypeHeaderDelegate extends AbstractHeaderDelegate<MediaType> {
    /** {@inheritDoc} */
    @Override
    public Class<MediaType> support() {
        return MediaType.class;
    }

    /** {@inheritDoc} */
    public MediaType fromString(String header) {
        if (header == null) {
            throw new IllegalArgumentException();
        }

        try {
            int p = header.indexOf('/');
            int col = header.indexOf(';');

            String type;
            String subType = null;

            if (p < 0 && col < 0) // no '/' and ';'
            {
                return new MediaType(header, null);
            } else if (p > 0 && col < 0) // there is no ';' so no parameters
            {
                return new MediaType(HeaderHelper.removeWhitespaces(header.substring(0, p)),
                                     HeaderHelper.removeWhitespaces(header.substring(p + 1)));
            } else if (p < 0 && col == 0) { // string just start from ';'
                type = null;
                // sub-type is null
            } else if (p < 0 && col > 0) { // there is no '/' but present ';'
                type = HeaderHelper.removeWhitespaces(header.substring(0, col));
                // sub-type is null
            } else { // presents '/' and ';'
                type = HeaderHelper.removeWhitespaces(header.substring(0, p));
                subType = header.substring(p + 1, col);
            }

            Map<String, String> m = new HeaderParameterParser().parse(header);
            return new MediaType(type, subType, m);

        } catch (ParseException e) {
            throw new IllegalArgumentException(e);
        }
    }

    /** {@inheritDoc} */
    public String toString(MediaType mime) {
        StringBuilder sb = new StringBuilder();
        sb.append(mime.getType()).append('/').append(mime.getSubtype());

        for (Entry<String, String> entry : mime.getParameters().entrySet()) {
            sb.append(';').append(entry.getKey()).append('=');
            HeaderHelper.appendWithQuote(sb, entry.getValue());
        }

        return sb.toString();
    }
}
